Plate changer and chromatograph including the plate changer

A plate changer that carries out supply and collection of a sample plate to an autosampler, comprising:

• a casing that stores a sample plate;
• one or a plurality of first rack plates that each support the sample plate;
• one or a plurality of plate supporters that respectively support the one or plurality of first rack plates at different heights in the casing;
• and
• a first detector that detects whether the first rack plate is supported on each plate supporter,
• wherein each first rack plate is configured to be supportable on and removable from the one or plurality of plate supporters,
• the first detector includes one or a plurality of rack plate detectors that are respectively provided corresponding to the one or plurality of plate supporters,
• each rack plate detector including
• a first movable member configured to be changeable between a first state and a second state, and
• a first sensor that detects which one of the first state and the second state the first movable member is in, and
• the first movable member is provided to be brought into the first state when the first rack plate is not supported on the corresponding plate supporter and brought into the second state when the first rack plate is supported on the corresponding plate supporter.

A plate changer that carries out supply and collection of a sample plate to an autosampler, comprising:

• a casing that stores a sample plate;
• one or a plurality of first rack plates that each support the sample plate;
• one or a plurality of plate supporters that respectively support the one or plurality of first rack plates at different heights in the casing;
• a first detector that detects whether the first rack plate is supported on each plate supporter;
• and
• a second detector that detects whether the sample plate is placed on each of the one or plurality of first rack plates supported on the one or plurality of plate supporters,
• wherein each first rack plate is configured to be supportable on and removable from the one or plurality of plate supporters,
• the second detector includes one or a plurality of first plate detectors respectively provided corresponding to the one or plurality of plate supporters,
• each first plate detector including
• a second movable member configured to be changeable between a third state and a fourth state, and
• a second sensor that detects in which one of the third state and the fourth state the second movable member is in,
• wherein the second movable member is provided to be brought into the third state when the first rack plate is not supported on the corresponding plate supporter and when the first rack plate is supported on the corresponding plate supporter and the sample plate is not supported on the first rack plate, and brought into the fourth state when the first rack plate is supported on the corresponding plate supporter and the sample plate is supported on the first rack plate.

A plate chancier that carries out supply and collection of a sample plate to an autosampler, comprising:

• a casing that stores a sample plate;
• one or a plurality of first rack plates that each support the sample plate;
• one or a plurality of plate supporters that respectively support the one or plurality of first rack plates at different heights in the casing;
• and
• a first detector that detects whether the first rack plate is supported on each plate supporter,
• wherein each first rack plate is configured to be supportable on and removable from the one or plurality of plate supporters,
• the plate changer further comprising one or a plurality of second rack plates that are fixed at heights different from the heights of the one or plurality of plate supporters in the casing and each support the sample plate.